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A precise three-dimensional measurement method based on line-structured light-driven holographic interferometry

A holographic interference and line structured light technology, applied in the field of precision measurement, can solve the problems of coordinate system registration troubled by rapid and precise detection of parts, and achieve the effect of reducing the difficulty of clamping and positioning

Active Publication Date: 2020-03-27
哈尔滨安宇迪航空工业股份有限公司
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Problems solved by technology

Since the surface of the blade is a complex surface without features, the problem of coordinate system registration is a major problem that plagues the rapid and precise detection of such parts

Method used

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  • A precise three-dimensional measurement method based on line-structured light-driven holographic interferometry
  • A precise three-dimensional measurement method based on line-structured light-driven holographic interferometry
  • A precise three-dimensional measurement method based on line-structured light-driven holographic interferometry

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Embodiment Construction

[0018] The working principle of the measurement method of the present invention is as follows: first, the global coordinate system calibration of the line structured light sensor and the holographic interference sensor is carried out, so that the line structured light vision sensor and the holographic interference sensor work in the same coordinate system; For example, fast scanning measurement of turbine blades, multiple linear 3D point cloud data of parts are obtained, curve fitting and data processing are performed on the point cloud data, and holographic interferometric measurement paths are generated. The four-axis control system drives the holographic interferometric sensor according to the generated The path is finely measured, and the complete high-precision point cloud data of the part is finally obtained.

[0019] A precision three-dimensional measurement method for line-structured light-driven holographic interferometry, which uses four-axis linkage equipment to plan...

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Abstract

The invention discloses a line structured, light driven and holographic-interfered accurate three-dimensional measuring method to achieve the aim of generating a holographic-interfered sensor measuring path. The method comprises the following steps that coordinates of line structured light scanning measurement and holographic-interfered measurement are uniformly calibrated; scanning measurement and curve fitting are conducted; curve segmentation and extension treatment are conducted, curve overall coordination system unified transformation is conducted; and all measuring paths of holographic-interfered measurement are generated. The method has the beneficial effects that a low-cost line structured optical sensor and high-accurate point-light ranging sensor are combined, clamping difficultyin the measuring process is reduced, the problem that during a traditional batch measuring process, coordinate system registration is conducted to each accessory is converted to the problem of stablesolution that only one time of global calibration is required, and therefore automatic, quick and accurate three-dimensional measuring for blades in bulk and without registering is achieved.

Description

technical field [0001] The invention belongs to the field of precision measurement, and in particular relates to a precision measurement method of line-structured light-driven holographic interference. It is especially suitable for non-contact rapid and precise measurement of complex curved surface parts such as aero-engines and gas turbine blades. Background technique [0002] In the prior art, for special-shaped parts with complex shapes, such as turbine blades or impellers, which have high-performance surfaces and complex shapes, it is difficult to measure them. The existing technologies cannot simultaneously achieve the purpose of high-precision and high-efficiency non-coating measurement. [0003] As an extremely critical part in aero-engines and gas turbines, the blades work in a very harsh environment and bear multiple loads such as aerodynamic force and centrifugal force. Any manufacturing defects will affect the final working efficiency and service life of the engin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
CPCG01B11/2441
Inventor 何万涛郭延艳马鹤瑶车向前孟祥林边莉
Owner 哈尔滨安宇迪航空工业股份有限公司
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